Arithmetic

Notes on basic math operations and computer primitives.

Integers

Division

Given 2 integers n, m, integer division returns the integer portion of the divided value.
This is floored result of true-division for positive numbers. In C, this rounds to zero but Python rounds down.
E.g. 5/2 returns 2

# Round down
n/m

# To round up always
(n + m - 1) / m

# To round to nearest
(n + (m/2)) + m

Rounding

Types of rounding

• Round towards zero
• Round down, i.e. towards negative infinity